Inductional water heater



May 29, 1928.

F. C. OWEN INDUCTIONAL WATER HEATER Filed Oct. 28, 1926 2 Sheets-Sheet Al gwventoz May 29, 1928. 1,671,839

F. C. OWEN INDUGTIONAL WATER HEATER Filed Oct. 28, 1926 2 Sheets-Sheet 2E a 0mm,

l I attozmq Patented May 29, 1928.

um'reo STATES PATENT OFFICE.

FREDERICK CARLISLE OWEN, OF FAYETTEVILIJE NORTH CAROLINA.

I TNDUCTIONAL WATEB'HEA'IEB.

Application fled October 28, 1928. Serial 110. 144,818.

With the foregoing and other objects in view, the nature of which willbecome ap- 1o parrent as the description proceeds, the 1nventionconsists of the construction, combination and arrangement ofpartshereinafter full described and claimed, and illustrated v in t eaccompanying drawings, wherein; Figure 1 is an elevational view of aninductional water heater constructed in accord- 'ance with my invention,

Figure 2 is a detail sectional v1ew taken on the plane indicated by theline 22 of Figure 1,

Figure? is a similar view taken on the plane indicated by the line 3- 3of Figure 1,

Figure 4 is a detail elevational view of the secondary coil of theheater,

Figure 5 is an elevational view of a slightly modified form of theheater,

Figure 6 is a detail sect1onal v1ew taken on the plane indicated by theline 66 of Figure 5,

Figure 7 is an elevational view of a further modified form of theheater, and

Figure 8 is an elevational view illustrating a' still further modifiedform of the heater.

The heater is in the form of a transformer comprising a hollow laminatedcore 1 through which the water to be heated c1r-' culates and of which 2is the inlet and 3 the outlet. The core 1, which provides a closedmagnetic path, may be of rectangular contour, as shown, or of any otherdeslred configuration, and consists of a coiled tube made of iron, steelor other suitable metal and bent or casted in the desired shape. Theprimary winding of the heater comprises coils 4, 5 and 6 which aredistributed about the major portion of the core 1 and connected to anysuitable source of current supply by leads 7 and 8. The primary coils 4,5 and 6 may be made of iron or steel wire or tubing or' of copper .wireor tublng, and are insulated to withstand high temperatures. Thesecondary winding of the heater consists of a hollow coil 8 which isdistributed about the minor portion of the core 1 and through which thewater to be heated passes after first passing through the core. Thesecondary coil 8 is ofthe closed circuit t pie, and the lead 9connecting the ends t ereof is preferably hollow. The lead 9 is incommunication with the secondary coil 8 at points adjacent the inlet -10and outlet 11 thereof. The outlet 3 of the core 1 and the inlet 10 ofthe secondary coil 8 are in communication and connected preferably by aninsulating coupling 12.

Current flowing through the pri'mar coils 4, 5 and 6 tend to cause amagnetic ux to circulate through the core 1, and the induced currentflowing through the closed circuit secondary coil 8 .tends to set up amagnetic flux independent of and opposed to that generated by theprimary coils. The current flowing through the primary coils 4, 5 and 6,the current flowing through the closed circuit secondary coil 8, theprimary and secondary fluxes circulating through the core 1, and thereaction taking place constantly between these fluxes in the core, heatthe water flowing through the core and secondary coil to a high degreein a comparatively short time. As they extend over the major portion ofthe. core 1, the primary coils 4, 5 and 6 tend to confine the reactionbetween the primary and secondary fluxes to the minor portion of thecore, with the result that the greatest possible reaction between thefluxes is attained and such reaction takes place in the immediatevicinity of the secondary coil 8 which is thus heated to a degree higherthan the core 1 and subjects the water to the highest temperature as itis leaving the heater. If desired the primary winding may be made oftubing as shown in Figure 8 so as to permit the water to also circulatetherethrough, and when so made the ends thereof will be connected to thecore land secondary coil 8 through the medium of insulating couplings 13and 14. The inlet end of the core 1 and the outlet end of the secondarycoil 8 are provided with insulating couplings 15 and 16, respectively.As practically all the heat generated in the core 1, primary coils 4, 5and 6, and secondary coil 8 is utilized, the heater is highly eflicientand may be maintained in 1 operation at a comparatively small cost.

The heater shown in Figure 5 diifers but slightly from the one shown inFigures 1-4. The core and primary winding of this heater are similar tothe corresponding parts of the other heater. 'Its secondary winding is,however, different, and embodies a main of this heater preferably by aninsulating .vide a closed circuit secondary by ho ow leads 9 and 9". 10designates the inlet and 11 the outlet of this secondary, and the formeris connected to the outlet 3 of the core 1 preferably by .an insulatingcoupling 12. In this heater, the water passes first through the core 1,then through the secondary coil 8 and thence through the secondary coil8. As the secondary coil 8 is heated to a higher temperature than thecore 1, and as the secondary coil 8 is heated to a higher temperaturethan the secondary coil 8*, due to the fact that practicall all the fluxgenerated by the primary coi s 4, 5 and 6 threads the same, the water inpassing through the heater is subjected to gradually increasingtemperatures.

Excellent results have been attained from the use of the heater shown inFi e 7. This heater differs from the others in that it is not providedwith a seconda winding. The core and winding of this eater are similarto the cores and primary windings of the other heaters and aredesignated by the same reference numerals. An outlet pipe 15 isconnected to the outlet 3 of the core 1 coupling 12". The currentflowing through the coils 4, 5 and 6 of this heater, and the fluxgenerated by the current and circulat-' ing t rough the core 1 of theheater, produces sufiicient heat to raise the temperature of water. to ahigh degree during its passage through the core.

From the foregoing description, taken in connection with theaccompanying drawings, it will be apparent that the heaters arecomaratively sim le and inexpensive of manuacture, that they involve noparts a t to get out of order and subject'to wear, an that they will reidly heat water to a hi h temperature wit the use of comparative ylittle current.

What is claimed is 1. A fluid heater comprising a tube coiled to providea laminated hollow core and a circuitous path for the liquid to beheated, and a primary winding on the core.

2. A fluid heater comprising a tube coiled to provide a laminated hollowcore and a circuitous path for the fluid to be heated, and a.

primary winding distributed over a greater portion of the core.

3. A fluid heater comprisin a hollow core having an inlet and an out et,a primary winding on the core, and a hollow secondary winding on thecore and having an inlet and an outlet, the outlet of the corecommunicating with the inlet of the secondary winding to permit thefluid to be heated to circu- 5. A fluid heater comprising a hollow corehaving an inlet and an. outlet, 9. primary winding on themajorportion'of the core,

and a hollow secondary winding on the minor portion of the core andhaving an inlet and an outlet, the outlet of the core communicating-withthe inlet of the secondary winding to permit the fluid to be heated tocirculate through both of said parts.

6. A fluid heater comprising a hollow core having an inlet and anoutlet, a rimary winding on the major portion of t e core, and a closedcircuit hollow secondary winding on the minorportion of the core andprovided with an inlet and an outlet, the outlet of the corecommunicating with the inlet of the secondary winding to permit thefluid to be heated to circulate through both of said parts.

7. A fluid heater comprising a hollow core having an inlet and anoutlet, 2. primary winding on the core, and a hollow secondary windingon different portions of the core and provided with' an inlet and anoutlet,

the outlet'of the core communicating with the inlet of the secondarywinding to permit the fluid to be heated to circulate through both ofsaid parts.

7 8; A fluid heater comprising a hollow core having an inlet and anoutlet, a primary winding on the core, and a closed circuit hollowsecondary win consistin of communicating coils on di erent portions ofthe core and provided with an inlet and an outlet, the outlet of thecore communicating with the inlet of the seconda windin to permit thefluid to be hea to circu ate through both of said parts.

9. A fluid heater comprising a hollow core having an inlet and anoutlet, a primary winding on the major portion of the core, and a hollowsecondary winding consisting of communicating coils and provided with aninlet and an outlet, one of the coils being on the major portion and theother on the minor portion of the core, and the inlet of the corecommunicating withthe inlet of the secondary winding to permit the fluidto be core having an inlet and an outlet, a primary winding on the ma orportion of the core,

and a closed circuit'hollow secondary wind- 1 ing consisting ofcommunicating coils'and provided with an inlet and an outlet, one of thecoils being on the major portion and the other on the minor portion ofthe core, and the outlet of the core communicating with theinlet on thesecondary winding to ermit the fluid to be heated to circu ate throughboth of said parts.

11. A fluid heater comprising a hollow core having an inlet and anoutlet, a hollow primary windingmounted-on the core and provided with aninlet and outlets, the inlet of the primary winding communication withthe core, and a hollow secondary winding mounted on the core andprovided with inlets communicating with the outlets ofthe primarywinding, the secondary winding being rovided with an outlet, and thefluid to be eated passing through the core, and primary and secondarywindings.

12. A fluid heater comprising a laminated hollow core having an 'inletand an outlet,' a primary winding on the core, and a closed circuithollow secondary winding consisting of communicating coils on difierentportions of the core and provided with an inlet and an outlet, theoutlet of the core communicating with the inlet'of the secondary windingto permit the fluid to be heated to circulate through both of said partsand both of said1 parts providing circuitous paths for the flui Intestimony whereof I aflix my sighature.

FREDERICK CARLISLE OWEN.

